EUROQUARTZ CX-3S-SM11.0B Cx miniature crystal Datasheet

CX MINIATURE CRYSTALS
CX-3-SM
EUROQUARTZ
Telephone:
+44(0)1460 230000
Fax:
+44(0)1460 230001
Email: [email protected]
Web: www.euroquartz.co.uk
Page
800kHz to 1.35MHz
LOW-PROFILE
MINIATURE
SMD CRYSTAL
1 of 2
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General Description
CX-3-SM quartz crystals are leadless devices designed for surfacemounting on printed circuit boards or hybrid circuits. Hermetically
sealed in a rugged, ceramic package, the crystals are produced
utilizing a photo-lithographic process giving excellent repeatability
and consistent high quality.
800kHz to 1.35MHz
Extensional
A:
±0.05% (±500ppm)
B:
±0.1%
C:
±1.0%
7pF
Load Capacitance:
5kW max.
Motional Resistance (R1):
1.2fF
Motional Capacitance (C1):
150k
Quality Factor (Q):
1.0pF
Shunt Capacitance (C0):
3mW max.
Drive Level:
35°C
Turning Point (T0)**:
-0.035ppm/°C2
Temperature Coefficient (k):
Note: Frequency (f) deviation from frequency (f0) @ turning point
temperature (t0) =
f-fo k(T-To)2
=
fo
±5ppm max.
Ageing, first year:
1,000g peak, 0.3ms, ½ sine
Shock:
10g rms 20-1,000Hz random
Vibration, survival:
-10°~+70°C (commercial)
Operating Temperature:
-40°~+85°C (industrial)
-55°~+125°C (military)
-55°C~+125°C
Storage Temperature:
260°C for 20 seconds
Max. Process Temperature:
A
D
D
B
C
E
Outline
CX-3-SM Package Dimensions
Dimension
Typical
(mm)
Maximum
(mm)
A
6.73
B
2.62
2.90
C
-
see below
D
1.27
1.52
E
1.32
1.57
Dimension
“C”
Glass Lid
(mm max.)
7.11
Ceramic Lid
(mm max.)
SM1
1.47
1.75
SM2
1.52
1.80
SM3
1.60
1.88
Specification
Frequency Range:
Functional Mode:
Calibration Tolerance*:
D
(TO P)
Extensional mode
Ideal for use with microprocessors
Designed for low power applications
Compatible with hybrid or PCB mounting
Low ageing
Full military environmental testing available
Ideal for battery operated applications
Specifications are typical at 25°C unless otherwise indicated.
*
**
Closer frequency calibration available
Other turning point available
Equivalent Circuit
Terminations
1
L1
C1
R1
C0
L 1 Motional Inductance
C 1 Motional Capacitance C0 Shunt Capacitance
R 1 Motional Resistance
2
Designation
Termination
SM1
Gold Plated
SM2
Nickel, Silver Plated
SM3
Nickel, Solder Plated and Solder Dipped
CX MINIATURE CRYSTALS
CX-3-SM
EUROQUARTZ
Telephone:
+44(0)1460 230000
Fax:
+44(0)1460 230001
Email: [email protected]
Web: www.euroquartz.co.uk
Page
800kHz to 1.35MHz
LOW-PROFILE
MINIATURE
SMD CRYSTAL
2 of 2
Circuit Design
Conventional HCMOS Pierce Oscillator Circuit
Typical Pierce Oscillator Application
The low profile CX miniature surface-mount crystal is ideal for small,
battery operated portable products. The CX crystal designed in a
Pierce oscillator (single inverter) circuit has a very low current
consumption with high stability. A conventional HCMOS Pierce
oscillator circuit is shown below. The crystal is effectively inductive
and in a Pi network with C1 and C2 which provides the additional
phase-shift necessary to sustain oscillation. The oscillation frequency
(f0) is 15ppm to 150ppm above the crystal’s series resonant
frequency (FS).
Rf
Amplifier
CS
C1
Drive Level
C2
Solder Pad Layout
1.78
Load Capacitance
The CX crystal calibration tolerance is influenced by the effective
circuit capacitances, specified as the load capacitance (CL.) CL is
C x C2
CL = 1
C
C1 + C2 + S
NOTE: C1 and C2 include stray layout capacitance to ground. CS is
the stray shunt capacitance between the crystal terminals. In
practice, the effective valus of CL will be less than that calculated
from C1, C2, and CS values due to the effect of the amplifier output
resistance. CS should be minimized.
The oscillation frequency (f0) is approximately equal to:
f 0 = f S 1+
C1
2(C0 + CL )
3.05
5.46
Packaging
CX-3H-SM- Bulk Pack (Standard)
- 16mm tape, 178mm or 330mm reels (Optional)
per EIA 481
- Tray Pack (Optional)
Where FS = Series resonant frequency of the crystal
C1 = Motional Capacitance
C0 = Shunt Capacitance
Order Code
CX-3
Osc.
Freq. (Fo)
RA
CX-2
RA is used to limit the crystal’s drive level by forming a voltage
divider between RA and C1. RA also stabilizes the oscillator against
changes in the amplifiers output resistance (R0). RA should be
increased for higher voltage operation.
Buffer
C = Ceramic Lid
Blank = Glass Lid
-SM1
“S” if special
or custom design
Blank if standard
SM1
SM2
SM3
Frequency
1.0MHz
( A
Calibration
Tolerance*
@ 25°C
A, B, C
*For other calibration
tolerances enter
figure in ppm
/
I
)
Temperature
Range:
C = Commercial
I = Industrial
M = Military
S = Specify
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